Extrusion is a mechanical process involving the formation of a material object or shape by forcing a substance through a die or opening of a specific cross-sectional profile. In engineering and manufacturing, this technique is widely used to create continuous or uniform cross-sectioned items from raw materials such as metals, polymers, or composites. The efficiency of the process depends on controlling the applied force, the temperature of the material, and the geometry of the die. In a broader scientific context, the term can describe the forced expulsion or movement of biological material, such as cell migration through connective tissues, though this definition encompasses highly specialized biological mechanisms. Fundamentally, the principle relies on converting compressive force into a controlled geometric output.